diff options
| author | stig <stig@f5534014-38df-0310-8fa8-9805f1628bb7> | 2008-04-12 12:31:53 +0000 |
|---|---|---|
| committer | stig <stig@f5534014-38df-0310-8fa8-9805f1628bb7> | 2008-04-12 12:31:53 +0000 |
| commit | daeb15669a09afc7edc952c333493809e9b618de (patch) | |
| tree | 215d99e3cb9d10b3733385f522b6f30463a28b8b /epan/crc32.h | |
| parent | 7f722226cc6ffa6d7508b84989a358537bf7653c (diff) | |
From Philip Frey (bug 2420):
Merge of the CRC32C calculation out of packet-iscsi.c and packet-sctp.c
into the already existing crc32.c and crc32.h files.
git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@24930 f5534014-38df-0310-8fa8-9805f1628bb7
Diffstat (limited to 'epan/crc32.h')
| -rw-r--r-- | epan/crc32.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/epan/crc32.h b/epan/crc32.h index b497b04290..8de3148e38 100644 --- a/epan/crc32.h +++ b/epan/crc32.h @@ -31,6 +31,28 @@ extern "C" { #endif /* __cplusplus */ +#define CRC32C_PRELOAD 0xffffffff + +/* + * Byte swap fix contributed by Dave Wysochanski <davidw@netapp.com>. + */ +#define CRC32C_SWAP(crc32c_value) \ + (((crc32c_value & 0xff000000) >> 24) | \ + ((crc32c_value & 0x00ff0000) >> 8) | \ + ((crc32c_value & 0x0000ff00) << 8) | \ + ((crc32c_value & 0x000000ff) << 24)) + +#define CRC32C(c,d) (c=(c>>8)^crc32c_table[(c^(d))&0xFF]) + +extern const guint32 crc32c_table[256]; + +/** Compute CRC32C checksum of a buffer of data. + @param buf The buffer containing the data. + @param len The number of bytes to include in the computation. + @param crc The preload value for the CRC32C computation. + @return The CRC32C checksum. */ +extern guint32 calculate_crc32c(const void *buf, int len, guint32 crc); + extern const guint32 crc32_ccitt_table[256]; /** Compute CRC32 CCITT checksum of a buffer of data. |